The `diabetes`

data frame has 442 rows and 3 columns.
These are the data used in the Efron et al "Least Angle Regression" paper.

This data frame contains the following columns:

- x
a matrix with 10 columns

- y
a numeric vector

- x2
a matrix with 64 columns

The x matrix has been standardized to have unit L2 norm in each column and zero mean. The matrix x2 consists of x plus certain interactions.

Efron, Hastie, Johnstone and Tibshirani (2003) "Least Angle Regression"
(with discussion) *Annals of Statistics*